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If this just started on the same Mac you have been using for 2+ years with no problems then you have a hardware problem. Something in your iMac is starting to fail. That could be the hard drive or the RAM is going bad. It could also be the video card, and or the RAM on the video card is starting to fail.
First thing you should do is turn off the option to Use Graphics Processor in the performance tab of the LR preferences. See if that helps. If it doesn't then you need to start checking your hardware for problems.
Thank you for your answer.I will write the actions that i did..... 1.Uninstall and reinstall LR , 2.Open new catalog on new empty external HDD , 3.Download install and run a MAC clean programme , 4.Your advise. After all that the catalog that cause the pop up message still does...BUT i got no problem with the new catalog on new location (new HDD). So i am guessing that LR works ok but something stupid i have done with my main catalog on the first HDD i mentioned before.
Right now i work on the new catalog because i have something to deliver in time but tommorow i have to return to see again the problem that still exist when i try to open my basic catalog.
I think one start is to delete from that drive the last import files,then i'll copy that catalog somewhere,i dont know yet where i am still some confused.
Maybe if is it possible to buy an external SSD and plug ii in only for do the prosses edit and all this and after that MOVE everything to other discs so SSD remain empty for the nextworkflow,maybe that i just said is wrong but sounds ideal (i think)
Tommorow i'll return with response if i fix the problem, Thank you again.
There are backups of your main catalog. They are usually stored in a folder called Backups and that folder is located in the same folder as your catalog file. That is if you didn't move them or tell LR to store them someplace else. They are made weekly by default. So try opening the most recent backup and see if the problem persists. If you are using the CC 2015 or the 6 version of LR the backup files are Zipped up so you have to first Un-Zip it, Expand it, then try to open. If you are running LR 5 or earlier the backups are just copies of your original catalog and can be directly opened.